Electrical switch for elevators



(No Model.) 2 Sheets-Sheet 1. W. E. NIGKERSON.

ELECTRICAL SWITCH FOR ELEVATORS.

No. 404,015. Patented May 28, 1889.

WlTN EEEES (No Model.) 2 Sheets-Sheet 2.

W. E. NIGKERSON.

ELECTRICAL SWITCH FOR ELEVATORS.

No. 404,015. Patented May 28, 1889.

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\VILLIAM E. NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

ELECTRICAL SWITCH FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 404,015, dated May 28,1889. Application filed February 28, 1889. Serial No. 301,505. (Nomodel.)

To all whom it may concern:

Be it known that 1, WILLIAM EMERY NICK- ERSON, of Cambridge, in thecounty of Middlesex and State of Massachusetts, have invented certainnew and useful Improvements in Electrical Switches for Elevators, ofwhich the following, taken in connection with the accompanying drawings,is a specification.

My invention consists in combining with a hand-switch mechanism withinthe carriage of an elevator, electrically connected with the electricaldevices by which the hoisting mechanism is controlled, fixed cam piecesoutside and independent of the elevator-carriage, arranged to operatethe circuit-breaking devices within the car automatically, and thuscause the carriage to stop at the various landings when. desired.

An application of my invention is shown in the accompanying drawings, inwhich- Figure l is a view in elevation, showing sufficient portions ofan elevator to enable one to understand the location and generalarrangement of the parts that constitute my device. Fig. 2 shows theinterior of the switch-box in elevation. Fig. 3 is a vertical section ofthe switch-box taken on the line a: [c of Fig. 2, and Fig. 4; is avertical section of the switch-box taken 011 the line yyof Fig. 2.

In the drawings, A, Fig. 1, represents the elevator-well, Bt-hecarriage, and C the hoisting-rope. Within the carriage B, I place aswitclrbox, D, which is connected to the various wires of the electricsystem.

E is a wire passing from the switch-box D through the tube M to thebattery E. Thence the circuit passes to the device E, and returns to theswitch-box through the wire H.

K is awire leading from the switch-box D through the tube M to the motorI1, thence by the wire H" to the battery 11?, the circuit beingcompleted by the wires II III to the switch-box D.

P 1, Fig. 1, represent campieces fixed to the well-room wall, which areso arranged that the elevator-carriage in its passage will cause the pinN to come in contact with either of them. Then the said pin N will bepushed inward and make a break in the circuit, the effect of which willbe explained be low.

My switch-box construction is shown in Figs. 1, 2, and i and itsinterior devices are as follows: The wire or electrode His connected bybranches 71. 71. to the contact springplates N and L. The wire E passesto the switch-post E, and the wire K to the switchpost K. (See Fig. 2.)The contact-point N is connected to the switch S at S by the wire N, andthe contact-point L is connected to the switch S at S by the wire L. Thecontact springplate L is provided with a pushbutton, L, Fig. 4, itsresilience tending to keep it out of contact with the point L -that is,to keep the circuit open. On the contrary, the resilience of the contactspring-plate N tends to keep it in contactwith the contactpoint N onlyto be broken when the pin N is forced inward by coming in contact withone of the cam-pieces 1 (See Figs. 1 and The switch S is pivoted at S,Fig. 2, and can be turned to the right or left, as indicated by dottedlines, Fig. 2. 'When the switch S is vertical, both circuits are open.

In my device one of the devicesE", for instanceis intended for thepurpose of operating that part of the controlling mechanism of thehoistingunachine that causes the elevator-carriage to ascend, while theother acts upon the device for allowing the carriage to descend.

The operation of my invention is as follows: If it is desired to causethe elevator-carriage to go up, the switch S is turned to the left, sothat the post E is connected through the switch and the wire N, Fig. 2,to the contact N Thence the circuit is made through the springcontact-plate N, wires H H, device E wire E battery E, wire E to post Eand the circuit is complete, and will remain so until the carriage inits ascent causes the pin N to come in contact with the cam piece P, atwhich. point it will be pushed inward and force the plate N from thecontact-point N thus break ing the circuit and causing the carriage tostop. To cause the carriage to again start up ward, the switch S is leftin its place and the plate L is forced by the push-button L, Fig. 4,down onto the contact-point L This action substitutes a bridge(consisting of the wire L contact-point L plate L, and wire h) for theportion cut out via, the wire N3,0O11- tact-point N plate N, wire h andre-estalr lishes the circuit through the device E If the attendant holdsthe push-button L down, the elevator-carriage will continue to ascend,irrespective of the action of the campieces P and pin N. 1

To cause the carriage to descend, the switch S is turned to the rightand a circuit is established through the device H as follows: Startingfrom the battery H the circuit passes through the wires H II h, plate N,contactpoint N wire N to switch S; thence to switchpost K, wire K,device H and wire H to battery H Now the circuit is complete and willremain so until the elevator-carriage in its descent causes the pin N tocome in contact with one of the cam-pieces P, in which event the pin Nwill push the contact-plate N away from the contact-point N and thusbreak the circuit and stop the elevator-carriage.

To restore the circuit, the attendant has only to force the push-buttonL inward and a bridge will be made; as has already been'set forth. Toallow for the effect of the lateral movement of the carriage, due tolooseness of fit in its ways on the action of the cams P, I so constructthem that they will not press with a positive effect on the pin N, butwith a pressure that will not force the pin so hard as to cause anyinjury or beyond a certain fixed distance-that is, after the pin N hasbeen pressed in sufliciently to cause a separation 1. In an electricdevice for controlling the motion of an elevator-carriage, thecombination of a series of cam-pieces on the walls of the elevator-welldisposed with reference to the various landings and adapted to act upona circuit-breaking device within the carriage and cause the carriage toautomatically stop at said landings and so remain until the circuit hasbeen manually reestablished, with electrical circuits having terminalsWithin the carriage connected to said circuit-breaking device, and anelectric device adapted to actuate the controlling mechanism of thehoisting-engine, substantially as and for the purpose set forth.

2. In an electric device for controlling the motion of anelevator-carriage, the combination of the cams P P and acircuit-breaking device, as described, with an electric bridge adaptedto re-establish the electric circuit at the option of the attendant whensaid circuit has been automatically broken at a landing by a fixed campiece, substantially as described, and for the purpose set forth.

3. In an electric device for controlling the motion of anelevator-carriage, the combination of the switch S, posts E K,contact-points N L contact-plates N L, and the several connecting andcircuit wires, with an electric device, substantially as and for thepurpose set forth. Y

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 26th day of February, A.D. 1889.

WVILLIAM E. NIOKERSON.

VVitnesses FRANK G. PARKER, MA THEW M. BLUNT.

